The longer answer.
The most common failure mode isn't slow SEO — it's unmeasured SEO. Without a baseline (where you rank, what AI says about you, what your listings claim) there's no way to distinguish progress from noise, and no way to catch the vendor who reports "improvement" forever. Every engagement should start with numbers you can hold them to.
The second failure mode is scaling before proving. Publishing 400 templated pages before one of them demonstrably ranks just multiplies a bet that hasn't paid. Ship a measured batch, wait for the engines to respond, then scale what the data supports.
Related: Websites & SEO — how we build · Start with the $75 audit baseline